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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/api/api-arguments-inl.h"
#include "src/api/api-natives.h"
#include "src/builtins/builtins-utils-inl.h"
#include "src/builtins/builtins.h"
#include "src/logging/counters.h"
#include "src/logging/log.h"
#include "src/objects/objects-inl.h"
#include "src/objects/prototype.h"
#include "src/objects/templates.h"
#include "src/objects/visitors.h"
namespace v8 {
namespace internal {
namespace {
// Returns the holder JSObject if the function can legally be called with this
// receiver. Returns nullptr if the call is illegal.
// TODO(dcarney): CallOptimization duplicates this logic, merge.
JSReceiver GetCompatibleReceiver(Isolate* isolate, FunctionTemplateInfo info,
JSReceiver receiver) {
Object recv_type = info.signature();
// No signature, return holder.
if (!recv_type.IsFunctionTemplateInfo()) return receiver;
// A Proxy cannot have been created from the signature template.
if (!receiver.IsJSObject()) return JSReceiver();
JSObject js_obj_receiver = JSObject::cast(receiver);
FunctionTemplateInfo signature = FunctionTemplateInfo::cast(recv_type);
// Check the receiver.
if (signature.IsTemplateFor(js_obj_receiver)) return receiver;
// The JSGlobalProxy might have a hidden prototype.
if (V8_UNLIKELY(js_obj_receiver.IsJSGlobalProxy())) {
HeapObject prototype = js_obj_receiver.map().prototype();
if (!prototype.IsNull(isolate)) {
JSObject js_obj_prototype = JSObject::cast(prototype);
if (signature.IsTemplateFor(js_obj_prototype)) return js_obj_prototype;
}
}
return JSReceiver();
}
template <bool is_construct>
V8_WARN_UNUSED_RESULT MaybeHandle<Object> HandleApiCallHelper(
Isolate* isolate, Handle<HeapObject> function,
Handle<HeapObject> new_target, Handle<FunctionTemplateInfo> fun_data,
Handle<Object> receiver, BuiltinArguments args) {
Handle<JSReceiver> js_receiver;
JSReceiver raw_holder;
if (is_construct) {
DCHECK(args.receiver()->IsTheHole(isolate));
if (fun_data->GetInstanceTemplate().IsUndefined(isolate)) {
v8::Local<ObjectTemplate> templ =
ObjectTemplate::New(reinterpret_cast<v8::Isolate*>(isolate),
ToApiHandle<v8::FunctionTemplate>(fun_data));
FunctionTemplateInfo::SetInstanceTemplate(isolate, fun_data,
Utils::OpenHandle(*templ));
}
Handle<ObjectTemplateInfo> instance_template(
ObjectTemplateInfo::cast(fun_data->GetInstanceTemplate()), isolate);
ASSIGN_RETURN_ON_EXCEPTION(
isolate, js_receiver,
ApiNatives::InstantiateObject(isolate, instance_template,
Handle<JSReceiver>::cast(new_target)),
Object);
args.set_at(0, *js_receiver);
DCHECK_EQ(*js_receiver, *args.receiver());
raw_holder = *js_receiver;
} else {
DCHECK(receiver->IsJSReceiver());
js_receiver = Handle<JSReceiver>::cast(receiver);
if (!fun_data->accept_any_receiver() &&
js_receiver->IsAccessCheckNeeded()) {
// Proxies never need access checks.
DCHECK(js_receiver->IsJSObject());
Handle<JSObject> js_obj_receiver = Handle<JSObject>::cast(js_receiver);
if (!isolate->MayAccess(handle(isolate->context(), isolate),
js_obj_receiver)) {
isolate->ReportFailedAccessCheck(js_obj_receiver);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
return isolate->factory()->undefined_value();
}
}
raw_holder = GetCompatibleReceiver(isolate, *fun_data, *js_receiver);
if (raw_holder.is_null()) {
// This function cannot be called with the given receiver. Abort!
THROW_NEW_ERROR(
isolate, NewTypeError(MessageTemplate::kIllegalInvocation), Object);
}
}
Object raw_call_data = fun_data->call_code();
if (!raw_call_data.IsUndefined(isolate)) {
DCHECK(raw_call_data.IsCallHandlerInfo());
CallHandlerInfo call_data = CallHandlerInfo::cast(raw_call_data);
Object data_obj = call_data.data();
FunctionCallbackArguments custom(isolate, data_obj, *function, raw_holder,
*new_target, args.address_of_arg_at(1),
args.length() - 1);
Handle<Object> result = custom.Call(call_data);
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION(isolate, Object);
if (result.is_null()) {
if (is_construct) return js_receiver;
return isolate->factory()->undefined_value();
}
// Rebox the result.
result->VerifyApiCallResultType();
if (!is_construct || result->IsJSReceiver())
return handle(*result, isolate);
}
return js_receiver;
}
} // anonymous namespace
BUILTIN(HandleApiCall) {
HandleScope scope(isolate);
Handle<JSFunction> function = args.target();
Handle<Object> receiver = args.receiver();
Handle<HeapObject> new_target = args.new_target();
Handle<FunctionTemplateInfo> fun_data(function->shared().get_api_func_data(),
isolate);
if (new_target->IsJSReceiver()) {
RETURN_RESULT_OR_FAILURE(
isolate, HandleApiCallHelper<true>(isolate, function, new_target,
fun_data, receiver, args));
} else {
RETURN_RESULT_OR_FAILURE(
isolate, HandleApiCallHelper<false>(isolate, function, new_target,
fun_data, receiver, args));
}
}
namespace {
class RelocatableArguments : public BuiltinArguments, public Relocatable {
public:
RelocatableArguments(Isolate* isolate, int length, Address* arguments)
: BuiltinArguments(length, arguments), Relocatable(isolate) {}
inline void IterateInstance(RootVisitor* v) override {
if (length() == 0) return;
v->VisitRootPointers(Root::kRelocatable, nullptr, first_slot(),
last_slot() + 1);
}
private:
DISALLOW_COPY_AND_ASSIGN(RelocatableArguments);
};
} // namespace
MaybeHandle<Object> Builtins::InvokeApiFunction(Isolate* isolate,
bool is_construct,
Handle<HeapObject> function,
Handle<Object> receiver,
int argc, Handle<Object> args[],
Handle<HeapObject> new_target) {
RuntimeCallTimerScope timer(isolate,
RuntimeCallCounterId::kInvokeApiFunction);
DCHECK(function->IsFunctionTemplateInfo() ||
(function->IsJSFunction() &&
JSFunction::cast(*function).shared().IsApiFunction()));
// Do proper receiver conversion for non-strict mode api functions.
if (!is_construct && !receiver->IsJSReceiver()) {
if (function->IsFunctionTemplateInfo() ||
is_sloppy(JSFunction::cast(*function).shared().language_mode())) {
ASSIGN_RETURN_ON_EXCEPTION(isolate, receiver,
Object::ConvertReceiver(isolate, receiver),
Object);
}
}
// We assume that all lazy accessor pairs have been instantiated when setting
// a break point on any API function.
DCHECK_IMPLIES(function->IsFunctionTemplateInfo(),
!Handle<FunctionTemplateInfo>::cast(function)->BreakAtEntry());
Handle<FunctionTemplateInfo> fun_data =
function->IsFunctionTemplateInfo()
? Handle<FunctionTemplateInfo>::cast(function)
: handle(JSFunction::cast(*function).shared().get_api_func_data(),
isolate);
// Construct BuiltinArguments object:
// new target, function, arguments reversed, receiver.
const int kBufferSize = 32;
Address small_argv[kBufferSize];
Address* argv;
const int frame_argc = argc + BuiltinArguments::kNumExtraArgsWithReceiver;
if (frame_argc <= kBufferSize) {
argv = small_argv;
} else {
argv = new Address[frame_argc];
}
int cursor = frame_argc - 1;
argv[cursor--] = receiver->ptr();
for (int i = 0; i < argc; ++i) {
argv[cursor--] = args[i]->ptr();
}
DCHECK_EQ(cursor, BuiltinArguments::kPaddingOffset);
argv[BuiltinArguments::kPaddingOffset] =
ReadOnlyRoots(isolate).the_hole_value().ptr();
argv[BuiltinArguments::kArgcOffset] = Smi::FromInt(frame_argc).ptr();
argv[BuiltinArguments::kTargetOffset] = function->ptr();
argv[BuiltinArguments::kNewTargetOffset] = new_target->ptr();
MaybeHandle<Object> result;
{
RelocatableArguments arguments(isolate, frame_argc, &argv[frame_argc - 1]);
if (is_construct) {
result = HandleApiCallHelper<true>(isolate, function, new_target,
fun_data, receiver, arguments);
} else {
result = HandleApiCallHelper<false>(isolate, function, new_target,
fun_data, receiver, arguments);
}
}
if (argv != small_argv) delete[] argv;
return result;
}
// Helper function to handle calls to non-function objects created through the
// API. The object can be called as either a constructor (using new) or just as
// a function (without new).
V8_WARN_UNUSED_RESULT static Object HandleApiCallAsFunctionOrConstructor(
Isolate* isolate, bool is_construct_call, BuiltinArguments args) {
Handle<Object> receiver = args.receiver();
// Get the object called.
JSObject obj = JSObject::cast(*receiver);
// Set the new target.
HeapObject new_target;
if (is_construct_call) {
// TODO(adamk): This should be passed through in args instead of
// being patched in here. We need to set a non-undefined value
// for v8::FunctionCallbackInfo::IsConstructCall() to get the
// right answer.
new_target = obj;
} else {
new_target = ReadOnlyRoots(isolate).undefined_value();
}
// Get the invocation callback from the function descriptor that was
// used to create the called object.
DCHECK(obj.map().is_callable());
JSFunction constructor = JSFunction::cast(obj.map().GetConstructor());
DCHECK(constructor.shared().IsApiFunction());
Object handler =
constructor.shared().get_api_func_data().GetInstanceCallHandler();
DCHECK(!handler.IsUndefined(isolate));
CallHandlerInfo call_data = CallHandlerInfo::cast(handler);
// Get the data for the call and perform the callback.
Object result;
{
HandleScope scope(isolate);
LOG(isolate, ApiObjectAccess("call non-function", obj));
FunctionCallbackArguments custom(isolate, call_data.data(), constructor,
obj, new_target, args.address_of_arg_at(1),
args.length() - 1);
Handle<Object> result_handle = custom.Call(call_data);
if (result_handle.is_null()) {
result = ReadOnlyRoots(isolate).undefined_value();
} else {
result = *result_handle;
}
}
// Check for exceptions and return result.
RETURN_FAILURE_IF_SCHEDULED_EXCEPTION(isolate);
return result;
}
// Handle calls to non-function objects created through the API. This delegate
// function is used when the call is a normal function call.
BUILTIN(HandleApiCallAsFunction) {
return HandleApiCallAsFunctionOrConstructor(isolate, false, args);
}
// Handle calls to non-function objects created through the API. This delegate
// function is used when the call is a construct call.
BUILTIN(HandleApiCallAsConstructor) {
return HandleApiCallAsFunctionOrConstructor(isolate, true, args);
}
} // namespace internal
} // namespace v8